CN202872780U - Covering apparatus of ultra-wide band distribution system and radio frequency module thereof - Google Patents
Covering apparatus of ultra-wide band distribution system and radio frequency module thereof Download PDFInfo
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- CN202872780U CN202872780U CN 201220558159 CN201220558159U CN202872780U CN 202872780 U CN202872780 U CN 202872780U CN 201220558159 CN201220558159 CN 201220558159 CN 201220558159 U CN201220558159 U CN 201220558159U CN 202872780 U CN202872780 U CN 202872780U
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Abstract
The utility model provides a covering apparatus of an ultra-wide band distribution system and a radio frequency module thereof. The radio frequency module comprises a down gain temperature compensation unit and a down stage amplification unit used for receiving and processing down radio frequency signals, a power divider connected with the down stage amplification unit and used for dividing the down radio frequency signals into at least two paths; at least two down power amplifier units connected with the power divider and respectively used for power amplification of the at least two paths of down radio frequency signals; at least two up low-noise units respectively used for receiving and processing at least two paths of up radio frequency signals; a combiner connected with the at least two up low-noise units and used for combining the at least two paths of up radio frequency signals; and an up final-stage amplification unit and an up gain temperature compensation unit, wherein the up final-stage amplification unit is connected with the combiner. The radio frequency module provided by a preferable embodiment of the utility model supports four types of network standards, and reduces the construction cost and has a relatively good performance.
Description
[technical field]
The utility model relates to radio communication, relates in particular to cladding system and the radio-frequency module thereof of ultra broadband compartment system.
[background technology]
Along with the continuous evolution of cordless communication network, to 3G, arrive again following 4G by 2G, the phenomenon of many net coexistences is with long-term existence.Simultaneously, indoor distributed system has also obtained greatly developing, by the passive coaxial compartment system to active coaxial system, till now optical fiber distribution system again.The ultra broadband compartment system is the digital third generation indoor distributed system of realizing the common access of multi-modulation scheme multi-service.Ultra-broadband digital optical fiber distribution system (UW-DDS) comprises access multiservice platform (MSAP), light crosspoint (OSU) and light radio frequency unit (ORU).Wherein light radio frequency unit (ORU) is the capping unit of ultra broadband compartment system, and major function is to realize fiber optic stretch and with power amplification.
The tradition indoor distributed system is to adopt the single system network coverage, and each network has oneself independently terminal, power supply, feeder line, antenna etc.This solution has higher cost.
China Mobile's network comprises GSM900, DCS1800, TD-SCDMA (A) (being called for short TDA) and TD-SCDMA (F) (being called for short TDF) etc.Along with the fast development of China Mobile, require more and more higher to networking.The simple quantity that increases the base station that relies on can increase network construction cost, relies on to improve transmitting power and solve the indoor distributed system covering problem, and the interference between can increase equipment and lifting upward signal were made an uproar through the end of closing after the road.
[utility model content]
For overcoming defects, the utility model provides a kind of radio-frequency module of the capped end for the ultra broadband compartment system on the one hand.This radio-frequency module comprises: descending gain temperature compensation unit and descending one-level amplifying unit are used for receiving and processing downlink radio-frequency signal; The power splitter that is connected with described descending one-level amplifying unit is used for described downlink radio-frequency signal is shunted at least two-way; The descending power amplifier unit of at least two-way that is connected with described power splitter is respectively applied to the described at least two-way of power amplifier downlink radio-frequency signal; At least the up low noise of two-way unit is respectively applied to receive and process at least up radiofrequency signal of two-way; The mixer that is connected with the up low noise of described at least two-way unit is used for the up radiofrequency signal of described at least two-way is closed the road; Up final stage amplifying unit and up gain temperature compensation unit, described up final stage amplifying unit is connected with described mixer.
In a preferred version, described radio-frequency module comprises: the descending power amplifier unit of DCS, the descending power amplifier unit of TDF, the descending power amplifier unit of TDA and the descending power amplifier unit of GSM; And the up low noise of DCS unit, the up low noise of TDF unit, TDA up low noise unit and the up low noise of GSM unit.
In a preferred version, described radio-frequency module also comprises: the TDF up-downgoing switch that is connected with the descending power amplifier unit of described TDF, the up low noise of TDF unit; And the TDA up-downgoing switch that is connected with the descending power amplifier unit of described TDA, the up low noise of TDA unit.
In a preferred version, described TDF up-downgoing switch and TDA up-downgoing switch are insertion loss less than 1.0dB4GHz, the isolation radio-frequency (RF) switch greater than 49dB4GHz.
In a preferred version, the descending power amplifier unit of described DCS is connected power amplifier unit and is included with GSM: the filter, attenuator, automatic level controller, one-level amplifier, two-stage amplifier, final stage amplification, isolator and the coupler that connect in turn; Also comprise forward wave detector, reverse wave detector and operational amplifier, described forward wave detector, reverse wave detector are connected with coupler, and described operational amplifier connects described automatic level controller and forward wave detector.
In a preferred version, the descending power amplifier unit of described TDF is connected power amplifier and is included with TDA: the filter, coupler, radio-frequency (RF) switch, limited amplitude protection device, voltage-controlled attenuator, automatic level controller, one-level amplifier, two-stage amplifier, final amplifier and the microstrip coupler that connect in turn; Also comprise synchronous detector, operational amplifier and forward wave detector, described synchronous detector is connected with described coupler, and described forward wave detector is connected with described microstrip coupler, and described operational amplifier connects described automatic level controller and forward wave detector.
In a preferred version, described up gain temperature compensation unit and descending gain temperature compensation unit are temperature compensation resistance.
The cladding system that a kind of ultra broadband compartment system is provided on the other hand of the present utility model, comprise far-end optical module and mixer, it is characterized in that also comprise the aforesaid radio-frequency module that the utility model provides, described radio-frequency module connects described far-end optical module and mixer.
In a preferred version, also comprise the synchronization module that is connected with radio-frequency module.
In a preferred version, the downstream signal peak power output of described cladding system is 24dBm, and the upward signal peak power output is-5dBm.
The cladding system that the utility model preferred embodiment provides and radio-frequency module are all supported four kinds of network formats, have reduced construction cost, and have preferably performance.
[description of drawings]
The schematic block diagram of the cladding system of the ultra broadband compartment system that Fig. 1 provides for the utility model;
Fig. 2 is the schematic block diagram of the radio-frequency module of described cladding system;
Fig. 3 is the theory diagram of the descending power amplifier unit of DCS of described radio-frequency module;
Fig. 4 is the theory diagram of the descending power amplifier unit of TDF of described radio-frequency module.
[embodiment]
The peak power output of the downstream signal of the cladding system of the ultra broadband compartment system that preferred embodiment of the utility model provides is 24dBm, and the downstream signal gain is 33dB; The peak power output of upward signal is-5dBm that the upward signal gain is 41dB.
With reference to figure 1, this cladding system comprises far-end optical module 1, radio-frequency module 2, six frequency combiners 3 and synchronization module 4.
Radio-frequency module 2 is to support GSM900, DCS1800, TD-SCDMA (A) and four kinds of networks of TD-SCDMA (F), up-downgoing integrated module.It is GSM900 in the net frequency range: up 885～909MHz, descending 930～954MHz; DCS1800: up 1710～1735MHz, descending 1805～1830MHz; TD-SCDMA (A): up-downgoing 2010～2025MHz; TD-SCDMA (F): up-downgoing 1880～1920MHz.
Six frequency combiners 3 are cavity body filters, are divided into six passages, and frequency range is respectively 885～915MHz, 930～960MHz, 1710～1735MHz, 1805～1830MHz, 1880～1920MHz, 2010～2025MHz.Insertion loss≤1.5dB, return loss 〉=17.5dB, passband fluctuation≤0.6dB, isolation 〉=65dB.Six frequency combiners, 3 advantages are that insertion loss is little, have guaranteed the peak power output index request of product.Shortcoming is that volume is large.
Synchronization module 4 is binary channels of supporting TD-SCDMA (A) and TD-SCDMA (F), realizes the synchronization module of TD-SCDMA system up-downgoing handoff functionality.Frequency range is 1880～1920MHz, 2010～2025MHz.The principle of synchronization module 4 is by the processing to radio-frequency module 2 rectified signals, resolve and judgement, the output corresponding control signal realizes the control of uplink and downlink synchro switch to radio-frequency module 2, reach repeater and base station synchronization, guarantee the normal operation of TD-SCDMA system.
The operation principle of this scheme is as follows: down link is that optical module 1 receives the downlink optical signal that digital long-drawn transmits, light signal is converted to radiofrequency signal, export to radio-frequency module 2, be divided into four the tunnel by power splitter, the filter that enters respectively GSM900, DCS1800, TD-SCDMA (A), TD-SCDMA (F) carries out filtering, enters power amplifier and amplifies.Wherein the TD-SCDMA part is after filtering, the coupling unit signal carries out synchronization signal detection, the voltage signal that detects is transferred to synchronization module 4, process, resolve and judge, export corresponding voltage signal to the control of TD-SCDMA uplink synchronous switch and the control of down-going synchronous switch of radio-frequency module 2, control respectively the radio-frequency (RF) switch of the uplink downlink of TD-SCDMA.GSM900 after the amplification, DCS1800, TD-SCDMA (A) and TD-SCDMA (F) downstream signal be through six frequency combiners, closes to be transferred to behind the road and retransmit end.Otherwise up link.
With reference to figure 2, radio-frequency module 2 mainly comprises TDF (TD-SCDMA (F) up-downgoing switch 2.1, TDA (TD-SCDMA (A) up-downgoing switch 2.2, the descending power amplifier unit 2.3 of DCS, the up low noise of DCS unit 2.4, the up low noise of TDF unit 2.5, the descending power amplifier unit 2.6 of TDF, the descending power amplifier unit 2.7 of TDA, the up low noise of TDA unit 2.8, the descending power amplifier unit 2.9 of GSM, the up low noise of GSM unit 2.10, mixer 2.11, up final stage amplifying unit 2.12, up gain temperature compensation unit 2.13, power splitter 2.14, descending one-level amplifying unit 2.15, descending gain temperature compensation unit 2.16.
In the present embodiment, TDF up-downgoing switch 2.1 and TDA up-downgoing switch 2.2 all adopt high-isolation radio-frequency (RF) switch, insertion loss＜1.0dB4GHz, isolation＞49dB4GHz.
With reference to figure 3, the descending power amplifier unit of DCS comprises filter 2.3.1, ATT attenuator 2.3.2, ALC automatic level controller 2.3.3, one-level amplifier 2.3.4, two-stage amplifier 2.3.5, final amplifier 2.3.6, isolator 2.3.7, coupler 2.3.8, operational amplifier 2.3.9, forward detection 2.3.10, oppositely detection 2.3.11.
Filter 2.3.1 adopts the radio frequency Surface Acoustic Wave Filter.ATT voltage-controlled attenuator 2.3.2 adopts the PIN diode attenuator, realizes attenuation function, stepping 1dB, attenuation range 10dB according to tabulating method.ALC automatic level controller 2.3.3 adopts four PIN diode π type attenuators, and ALC starts to control rear input power and increases 10dB, and power output remains in the 1dB.One-level amplifier 2.3.4 adopts the plus and blowup pipe of the rich electronics of state, and P1dB is 20.0dBm1950MHz, gain 20.0dB1950MHz.Two-stage amplifier 2.3.5 adopts the high linear amplifier tube of the rich electronics of state, and P1dB is 28.0dBm1960MHz, gains to be 15.2dB1960MHz.Final amplifier 2.3.6 adopts the 2W amplifier tube of RFMD, and P1dB is 33.8dBm1960MHz, gains to be 13.7dB1960MHz.Isolator 2.3.7 guarantees the standing wave of output.Coupler 2.3.8 is that the coupling unit signal carries out forward detection and oppositely detection.Operational amplifier 2.3.9 is the low-power dual operational amplifier that adopts TI.Forward wave detector 2.3.10 is the detection tube that adopts Hittite, input power range is-50～+ 10dBm, accuracy of detection ± 1dB.Oppositely wave detector 2.3.11 is the detection tube that adopts ANALOG, and frequency range is 0.1～2.5GHz, and input power range is-45～0dBm.
The descending power amplifier unit of the descending similar DCS of power amplifier unit 2.9 design principles of GSM.
With reference to figure 4, the descending power amplifier unit of TDF comprises filter 2.6.1, coupler 2.6.2; radio-frequency (RF) switch 2.6.3, limited amplitude protection device 2.6.4, ATT voltage-controlled attenuator 2.6.5; ALC automatic level controller 2.6.6; one-level amplifier 2.6.7, two-stage amplifier 2.6.8, final amplifier 2.6.9; microstrip coupler 2.6.10; synchronous detector 2.6.11, operational amplifier 2.6.12, forward wave detector 2.6.13.
Filter 2.6.1 adopts the radio frequency Surface Acoustic Wave Filter.Coupler 2.6.2 coupling unit signal carries out synchronous detection.Radio-frequency (RF) switch 2.6.3 is the radio-frequency (RF) switch pipe that adopts Hittite, insertion loss 0.5dB, isolation＞45dB.Limited amplitude protection device 2.6.4 adopts limiter diode.ATT attenuator 2.6.5 adopts the PIN diode attenuator.ALC automatic level controller 2.6.6 adopts four PIN diode π type attenuators.One-level amplifier 2.6.7 adopts the amplifier tube of the rich electronics of state, and P1dB is 18.9dBm1950MHz, gain 16.3dB1950MHz.Two-stage amplifier 2.6.8 adopts the high linear amplifier tube of the rich electronics of state.Final amplifier 2.6.9 adopts the 2W amplifier tube of RFMD, amplifies with two Compositional balance formulas.Microstrip coupler 2.6.10 is that the coupling unit signal carries out the forward detection.Synchronous detector 2.6.11 is the detection tube that adopts ANALOG.Operational amplifier 2.6.12 is the low-power dual operational amplifier that adopts TI.Forward wave detector 2.6.13 is the detection tube that adopts Hittite.
The descending power amplifier of the descending similar TDF of power amplifier 2.7 design principles of TDA.
The up low noise of DCS unit 2.4 and the up low noise of GSM unit 2.10 all adopt the low noise pipe of RFMD, noise factor 0.8dB2GHz, and gain 24.5dB1GHz, P1dB is 22.4dBm2GHz.The up low noise of TDF unit 2.5 and the up low noise of TDA unit 2.8 all adopt the low noise pipe of Avago, noise factor 0.44dB1.9GHz, and gain 17.4dB1.9GHz, P1dB is 21dBm1.9GHz.
Mixer 2.11 adopts the up and up road of closing of TDF of DCS, and the road is closed on the up and up road of closing of GSM of TDA afterwards again.Power splitter 2.14 adopts and is divided into two, and wherein one the tunnel to be divided into DCS descending and GSM is descending, and other one the tunnel to be divided into TDF descending and TDA is descending.
Up final amplifier 2.12 adopts the plus and blowup pipe of the rich electronics of state.Descending one-level amplifier 2.15 adopts the high linear amplifier tube of the rich electronics of state.
Up gain temperature compensation unit 2.13 and descending gain temperature compensation unit 2.16 all adopt temperature compensation resistance, change in gain under the compensation high and low temperature environment.
The radio frequency amplifying circuit performing step:
1, down link comprises: step 1, descending input signal is through descending gain temperature compensator.Step 2, signal enter descending one-level amplifier tube and carry out the amplification of signal.Step 3, signal is divided into four road signals through power splitter.Step 4, four road signals enter respectively filter and carry out filtering.Step 5, GSM and DCS downstream signal are respectively through exporting behind voltage-controlled attenuator, automatic level controller, amplifier tube, isolator and the coupler.TDA and TDF downstream signal are respectively through exporting after coupler, radio-frequency (RF) switch, limited amplitude protection device, voltage-controlled attenuator, automatic level controller, amplifier tube, microstrip coupler and the up-downgoing diverter switch.
2, up link comprises: step 1, up four road input signals are respectively from four port inputs.GSM and DCS upward signal pass through respectively limited amplitude protection device, low noise pipe, filter, amplifier tube and voltage-controlled attenuator.TDA and TDF upward signal pass through respectively up-downgoing diverter switch, limited amplitude protection device, low noise pipe, filter, amplifier tube and voltage-controlled attenuator.Step 2, four road upward signals are combined into one the tunnel through mixer.Step 3, signal enter up final stage amplifier tube and carry out the amplification of signal.Step 4, signal is exported through behind the up gain temperature compensator.
Power output during described each amplifier tube work has guaranteed the linear index of product all far below its 1dB compression point.Select simultaneously the less device of operating current, guaranteed efficiency.
The implementation method of gain-adjusted: at the radio frequency link voltage-controlled attenuator of connecting, by the software setting, corresponding differential declines value arranges different magnitudes of voltage.When manually when monitoring interface arranges certain pad value, single-chip microcomputer reads pad value and exports the corresponding voltage value to voltage-controlled attenuator, regulates attenuation, thereby realizes the gain-adjusted function.
The implementation method of Temperature compensation for gain: at radio frequency link series connection temperature compensation attenuator, utilize the temperature compensation attenuator to vary with temperature, the characteristic that its attenuation changes compensates, thereby guarantees the constant gain of the radio frequency link under the different temperatures.
Forward power and backward power detect implementation method: it is by coupler coupling unit output signal that the forward power output detects, carry out power detection by entering detection tube after the decay bridge, power is changed into voltage, enter the single-chip microcomputer computing, draw performance number, show at monitoring interface.The backward power detection is the energy by coupler sampling reverse signal, carries out power detection by entering detection tube after the decay bridge, and power is changed into voltage, enters the single-chip microcomputer computing, draws performance number, shows at monitoring interface.
The limited amplitude protection function realizing method: at the input of radio frequency link limiter diode in parallel, during diode current flow, the amplitude of large-signal is limited in below the threshold voltage, has certain defencive function.
For the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. radio-frequency module is used for the capped end of ultra broadband compartment system, it is characterized in that, comprising:
Descending gain temperature compensation unit and descending one-level amplifying unit are used for receiving and processing downlink radio-frequency signal;
The power splitter that is connected with described descending one-level amplifying unit is used for described downlink radio-frequency signal is shunted at least two-way;
The descending power amplifier unit of at least two-way that is connected with described power splitter is respectively applied to the described at least two-way of power amplifier downlink radio-frequency signal;
At least the up low noise of two-way unit is respectively applied to receive and process at least up radiofrequency signal of two-way;
The mixer that is connected with the up low noise of described at least two-way unit is used for the up radiofrequency signal of described at least two-way is closed the road;
Up final stage amplifying unit and up gain temperature compensation unit, described up final stage amplifying unit is connected with described mixer.
2. radio-frequency module as claimed in claim 1 is characterized in that, described radio-frequency module comprises:
The descending power amplifier unit of DCS, the descending power amplifier unit of TDF, the descending power amplifier unit of TDA and the descending power amplifier unit of GSM; And
The up low noise of DCS unit, the up low noise of TDF unit, TDA up low noise unit and the up low noise of GSM unit.
3. radio-frequency module as claimed in claim 2 is characterized in that, described radio-frequency module also comprises:
The TDF up-downgoing switch that is connected with the descending power amplifier unit of described TDF, the up low noise of TDF unit; And
The TDA up-downgoing switch that is connected with the descending power amplifier unit of described TDA, the up low noise of TDA unit.
4. radio-frequency module as claimed in claim 3 is characterized in that, described TDF up-downgoing switch and TDA up-downgoing switch are insertion loss less than 1.0dB4GHz, the isolation radio-frequency (RF) switch greater than 49dB4GHz.
5. radio-frequency module as claimed in claim 2 is characterized in that, the descending power amplifier unit of described DCS and the descending power amplifier unit of GSM include:
The filter, attenuator, automatic level controller, one-level amplifier, two-stage amplifier, final stage amplification, isolator and the coupler that connect in turn;
Also comprise forward wave detector, reverse wave detector and operational amplifier, described forward wave detector, reverse wave detector are connected with coupler, and described operational amplifier connects described automatic level controller and forward wave detector.
6. radio-frequency module as claimed in claim 2 is characterized in that, the descending power amplifier unit of described TDF and the descending power amplifier of TDA include:
The filter, coupler, radio-frequency (RF) switch, limited amplitude protection device, voltage-controlled attenuator, automatic level controller, one-level amplifier, two-stage amplifier, final amplifier and the microstrip coupler that connect in turn;
Also comprise synchronous detector, operational amplifier and forward wave detector, described synchronous detector is connected with described coupler, and described forward wave detector is connected with described microstrip coupler, and described operational amplifier connects described automatic level controller and forward wave detector.
7. radio-frequency module as claimed in claim 1 is characterized in that, described up gain temperature compensation unit and descending gain temperature compensation unit are temperature compensation resistance.
8. the cladding system of a ultra broadband compartment system comprises far-end optical module and mixer, it is characterized in that, comprises that also such as the described radio-frequency module of any one in the claim 1 to 7, described radio-frequency module connects described far-end optical module and mixer.
9. cladding system as claimed in claim 8 is characterized in that, also comprises the synchronization module (4) that is connected with radio-frequency module (2).
10. cladding system as claimed in claim 8 or 9 is characterized in that the downstream signal peak power output of described cladding system is 24dBm, and the upward signal peak power output is-5dBm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220558159 CN202872780U (en) | 2012-10-29 | 2012-10-29 | Covering apparatus of ultra-wide band distribution system and radio frequency module thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220558159 CN202872780U (en) | 2012-10-29 | 2012-10-29 | Covering apparatus of ultra-wide band distribution system and radio frequency module thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297076A (en) * | 2013-05-15 | 2013-09-11 | 西安烽火电子科技有限责任公司 | Short-wave broadband multi-channel receiving device and method |
| CN104242965A (en) * | 2013-06-10 | 2014-12-24 | 三星电机株式会社 | Module and method for receiving RF signal |
| CN104467970A (en) * | 2014-11-28 | 2015-03-25 | 北京邮电大学 | Conversion device and method for transmitting signals in mixed mode |
| CN107094029A (en) * | 2017-04-18 | 2017-08-25 | 深圳国人通信股份有限公司 | A kind of RF Amplifier Module and its amplification method |
| CN111918154A (en) * | 2019-05-08 | 2020-11-10 | 华为技术有限公司 | Network device and terminal device |
| CN112019302A (en) * | 2020-08-25 | 2020-12-01 | 广东省新一代通信与网络创新研究院 | TDD and FDD coexisting forwarding subsystem and time sequence scheduling method of FDD frame structure |
| CN112234332A (en) * | 2020-10-15 | 2021-01-15 | 上海三吉电子工程有限公司 | Radio frequency combiner |
| CN113746554A (en) * | 2021-08-23 | 2021-12-03 | 福建信同信息科技有限公司 | Optical fiber radio frequency signal zooming device |
-
2012
- 2012-10-29 CN CN 201220558159 patent/CN202872780U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297076A (en) * | 2013-05-15 | 2013-09-11 | 西安烽火电子科技有限责任公司 | Short-wave broadband multi-channel receiving device and method |
| CN104242965A (en) * | 2013-06-10 | 2014-12-24 | 三星电机株式会社 | Module and method for receiving RF signal |
| CN104467970A (en) * | 2014-11-28 | 2015-03-25 | 北京邮电大学 | Conversion device and method for transmitting signals in mixed mode |
| CN107094029A (en) * | 2017-04-18 | 2017-08-25 | 深圳国人通信股份有限公司 | A kind of RF Amplifier Module and its amplification method |
| CN111918154A (en) * | 2019-05-08 | 2020-11-10 | 华为技术有限公司 | Network device and terminal device |
| CN112019302A (en) * | 2020-08-25 | 2020-12-01 | 广东省新一代通信与网络创新研究院 | TDD and FDD coexisting forwarding subsystem and time sequence scheduling method of FDD frame structure |
| CN112019302B (en) * | 2020-08-25 | 2023-03-17 | 广东省新一代通信与网络创新研究院 | Forwarding subsystem with coexisting TDD and FDD and time sequence scheduling method of FDD frame structure |
| CN112234332A (en) * | 2020-10-15 | 2021-01-15 | 上海三吉电子工程有限公司 | Radio frequency combiner |
| CN113746554A (en) * | 2021-08-23 | 2021-12-03 | 福建信同信息科技有限公司 | Optical fiber radio frequency signal zooming device |
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